I'm trying to extend my unallocated partition to my far right Ubuntu partition. I can't move /dev/sda5 to the left. I need to merge the two together somehow.

I'm trying to extend my unallocated partition to my far right Ubuntu partition. I can't move /dev/sda5 to the left. I need to merge the two together somehow.

In the screencap /dev/sda5 has a key next to it. The key icon beside a partition means that said partition is mounted and thus cannot be modified. Running GParted from a live (cd/usb) session should allow you to make the changes you need.
Live USB is the correct choice here. It will allow you to make changes in the root partition of your installation without any hassle.